<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>上左右布局</title>
    <style>

        .container{
            display: flex;
            flex-direction: column;
        }

        .content-container{
            display: flex;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="row">top</div>
    <div class="row content-container">
        <div class="nav">nav</div>
        <div class="content">content</div>
    </div>
</div>

</body>
</html>